Chuck for rock drills



Nov. 15, 1927. 1,649,651

L. C. BAYLES 0c DRILLS Filed Jan.1l. 1927 INVENTOR. Le 16 J30 d- BY HTSA T'TO EY Ill) Patented Nov. 15, 1927.

UNITED STATES PATENT OFFICE.

LEWIS C. BAYLES, OF EASTON, PENNSYLVANIA, ASSIGNQR TO INGERSOLL-RANDCOM- IPANY, OF JERSEY CITY, NEW JERSEY, A CORFORATION OF NEW JERSEY.

canon non noon DRILLS.

This invention relates to rock drills, but more particularly to chucksfor fluid ac tuated rock drills of the hammer type. More specificallythe invention pertains to that type of rock drill chuck which bothguides the working implement and also serves as an element in therotation mechanism for changing the position of the working implementfor each blow of the hammer piston.

One object of the invention is to strengthen the chuck mechanism.thereby eliminating the chances of breakage of these parts.

Another object is to reduce friction between the cooperating surfaces ofthe chuck and the front head to a minimum.

A still further object is to enable the parts con'iprising the chucktobe readily assembled and disassembled.

Other objects will appear hereinafter. The invention consists of thefeatures of construction and arrangen'ient ofparts substantially ashereinafter described and claimed and illustrated in the accompanyingdrawings, in which Figure 1 is a longitudinal sectional view of a rockdrill having the invention applied thereto, i

Figure 2 is a side view of the chuck bushing, and

Figure 3 is a transverse view taken through Figure 1 on the line 3-3looking in the direction of the arrows.

Referring to the drawings, A represents the front end of a rock drillcylinder in which is disposed a reciprocatory hammer piston B having aforward fluted nose or extension C. A bushing D forms a closure for thefront end of the cylinder A and is held in assembled position by a fronthead E which extends into the front end of the cylinder and abuts thebushing D.

In accordance with the present invention a chuck mechanism designatedgenerally by F is disposed in the front head E to rotate therein. Thechuck mechanism F in this in stance comprises two cylindrical members Gand H which, for the purpose of identification, will be referred tohereinafter as chuck and chuck jaw respectively. The chuck G is disposedin the rearward end of the front head E and carries a chuck nut J whichmay be suitably fluted to interlock slidahly with the fluted extension Cof the piston B.

In the construction shown, the chuck jaw H is disposed in the front endof' the front head E and is provided with theusual ribs lit whichinterlockwith wings L carried by the drill steel O for transmitting therotation of the chuckmembers to the drill steel.

Between the ribs K. are formed cavities P to permit limitedrotativemovement of the drill steel 0 in the chuck jaw. In this Waythewings L may be drawn out of line of the slots Q in a chuck key Rwhich is located in the front end of the front head E forretaining thesteel 0 in the front head.

In order to insure the proper location of the slot Q, with respect tothe operative position of the wings L, the chuck key R is provided withclutch members S of a well known type which interlock with suitablerecesse 1 formed in the front end of the. chuck jaw H. In thisway thechuck aw H and the key R will be caused to rotate as a unit in the fronthead E.

Heretofore. in rock drills employingthe type of chuck to which thepresent invention pertains, some difficulty has at times beenexperienced due to breakage of the means, such as clutch members,provided for holding the chuck and chuck jaw in interlockedrelationship. with respect to each other and when these partsare thusinter flockedfit is also difiicult at times to maintain the chuck andthechuck jaw in concentric relationship with respect to each other. As aresult, considerable friction is caused between the cooperating surfacesof these members and the front head wherein they rotate. In order toeliminate these un desirable features. the chuck G and the chuck jaw Hare in this instance provided with smooth unbroken contiguous surfaces Uand V respectively, preferably intended to abut each other when thechuck parts are in their operative positions; The chuck G is providedwith a central bore W which extends at the rearward end of the beret andbe tween this surface a and the cavities P are f the huehiug e isfermede e neeth uni-ib qke e rimetli t' urte 7 adap ed he beer eee e tml fit d l fffe w Y nd 6 i e l we e when th @huck eheekt it i u i leteni t tesee t W1 eth r- 1m ite te the ueet ee i e ibe lausl ieeeelee es asa g ide 0 1 ete'el Q "time e th end it pne de fel h .1; t eeite efideblythet tteetie i iewl th the weets f h h kb ehiee th h k end the etmchie Islibul if u will" at al ime be det rmine t e? the lq iizfi iiblu in h chit s d sir d to ag'ete tethe drill isteel. For instancefi'f it be dc,1i1,ec;l tg etetethedt'm stee in a c10ckdigeet ou leeki g item t e lefthand end 01' Figure 1, the cqeperating thneads eb uld b e a t h hee typtliliat d ng eee 'e tee pith? dr t the te d ncy f t drill t -e1 ll be beome -aptly ew th tl teetle t p i ne ght r mett e? 5 tt ee etiu ctewiingthem Les w ul be th use t he t ads eete sled i th cppesit di e tio -i itt it it t In ees nhlingith 911119 Qlfit filli lil; ell est Qt the t unkbeati g a m first b ee t it e eith n theeh i ik 9. 7 th chee hereefi theLethemem er s enit, will be held in .cehcent 'ic 7 itting thechuck mayhe sci-med on the bushing e. The parts thus assembled may then beinserted into the front head and liecated e0 that the clutch uemheus jftlic chuck key R will enter the Recess T of the chuck jaw H.

' means of the present invention the wells of the chuck, the chuck jawand the bushing e maybe constructed of suflicicut thicknese, tljl ficonsequent strength, to enable theirytc tvitliste u l the most severeueage and wear uithcut in ci'eeeiug the weight of the ,(Llfliil, Anotherdeeil uhle feature cf thie in- "c thgtij in cute it hccuu lce uc y Y evethe parts fer the piu'puse of; H1 epectieu c1 g'eplecement, the m tecognprie jhgthe chuck may readily be di e 5e uhled w ttheut the aid ezlspecial tools e1. appliwet dril req-t held e n wlt m mu p 'iei g frentheath e chuck and e chuck new 1 ,1 id from hea -t TJI chu am chuck jawhevi ig beg-es lelfttlllfill g the adjacent ends of said bores being ofsmooth cylindrical formation, threads in the bores, 21 chuckbushingextending into both home and having at here to siida hly recein'cthe shank pt 21 drill steel, threads theeude of W the bushing; tocooperete with the tinieude in the chuck ,aud chuckjmy for drawing the ede of the chuck mid chuck jaw tightly together, and an intermediateen'ieoth em terio; eurfece en the bushing hea ing 7 e eiuet the smeethcylindt'iczll portions ct t e bores for centralizing the chuck 11,1 61chuck jglw with reepect to eech ether.

In testimony whereof I have sighed this el e cetie -i LEWlg c, BAYLE3{

